Dial Up Solutions

Does anyone have any suggestions on equipment for our ISP that is still supporting dial up customers? At the moment we are running 3Com Total Control 1000's but are running out of spare parts as we have failures. Given that this gear is so old trying to source spare parts is proving to be difficult. We do have access to an Cisco AS5200 but are looking for maybe a SIP based solution that could possibly run on our VM farm? Has anyone heard of anything like that or does it even exist? What kind of gear are you running if you still are supporting dial up customers? Thanks in advance -- Will Duquette GWI Network Systems Engineer www.gwi.net